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Q. HIV's genome of RNA includes code for reverse transcriptase (RT), enzyme that acts early in infection to synthesize a DNA genome off of an RNA template. The HIV genome also codes for protease (PR), an enzyme that acts later in infection through cutting long viral polyproteins into smaller, functional proteins. Both RT and PR represent potential targets for antiretroviral drugs. Drugs called nucleoside analogs (NA) act against RT, whereas drugs known as protease inhibitors (PI) act against PR.
Which of these represents the treatment option that is most likely to avoid production of drug-resistant HIV (assuming no drug interactions or side effects)?
a. using series of NAs, one at a time, and changed about once a week
b. using single PI, but slowly increasing the dosage over the course of a week
c. using high doses of NA and a PI at the same time for a period not to exceed 1 day
d. using moderate doses of NA and of two different PI's at the same time for many months
Multicellular animals have some mechanism to control cell mass that we do not understand; for in case, salamanders of different ploidies are the same size such that a haploid, a diploid, and a pentaploid organism are about the same size.
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At another locus, sepia eyes are inherited as an autosomal (non sex linked) recessive. The presence of the white eye phenotype (x superscript w x superscript w in females, x superscript y in males) masks sepia phenotype, so regardless of the sepia ge..
What would be the expected frequencies of the homozygous dominant, heterozygous, and homozygous recessive after 100 generations.
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Briefly explain why this mating produces a triploid individual. Why can mitosis proceed normally in triploid cells, but meiosis cannot.
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